Drilling of wells
System section
Site plan
- Client
- Rother District Council
- Main contractor
- Dean and Dyball
- Consultant
- Terry Oakes Associates and GCG
- Supervising engineer
- Halcrow Group
- Pneumatic well system subcontractor
- WJ Groundwater Ltd
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A number of measures were used to arrest cliff recession, which was threatening residential property, including a permanent groundwater control scheme which was installed by WJ. The scheme comprises an array of 56 wells installed at 5 m centres along a road above the back scarp of the slip. The wells are 25 m deep and are pumped using an electro-pneumatic system driven from a purpose built compressor house. The well heads are in manholes with connecting ducts for the pneumatic control system and monitoring sensor cables. The compressor house also contains a datalogger and modem which uses flow meters and vibrating wire transducers to monitor the system performance. WJ was responsible for the control and maintenance of the scheme for the first 5 years of operation.
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Key words
- slope stability, permanent dewatering, clay, mudstone, electro-pneumatic wells